Canon RF 35mm F1.4 L VCM Instructions Manual page 14

7. Filters (Sold separately)
With this lens, filters can be attached to the front and back of the lens.
When using threaded filters
You can attach filters (ø67) to the filter mounting thread on the front of the lens.
Only one filter may be attached.
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If you need a polarizing filter, use the Canon Circular Polarizing Filter PL-C B.
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Detach the hood when adjusting the polarizing filter.
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